Re: cyanotype, the missing formula

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From: Cor Breukel (cor@lumc.nl)
Date: 10/15/01-04:58:47 AM Z

Alberto,

Probably your counting illustrates that the ratio's aren't that
important, and that the "classic" cyanotype formula is very flexable.

For in-depth reading on cyanotype see Mike Ware's book on Cyanotype,
Christopher James his excellent book on Alth photo, and last but by no
means least: on of the recent issues of PF has a wealth of great info on
Cyanotype

Best,

Cor

"alnovo@inwind.it" wrote:
>
> After a search on the net, I have found 31 different suggested formulas for making a cyanotype. The ratio (iron citrate)/(pot. ferricyanide) ranges from 0.7 up to 8.25, while the concentration of iron citr. ranges from 14 to 54%. One formula gives a 3:1 mix of saturated solutions, and another one a 1:1 mix of saturated *brown* iron citrate and 50% pot. *ferrocyanide* (yes, k4Fe(CN)6).
> The so-called "classical" formula calls for 20% iron, 8% ferric. (2,5 ratio).
> At this point I myself could give my 32th formula...
>
> Are there experiences on the effects of varying the strength of the solution and the ratio of citrate to ferricyanide (at constant paper brand...)?
> Please, don't tell me to look at the archives!
>
> Alberto

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